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diff --git a/prolog/problems/lists/evenlen_1_+_oddlen_1/en.py b/prolog/problems/lists/evenlen_1_+_oddlen_1/en.py
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+++ b/prolog/problems/lists/evenlen_1_+_oddlen_1/en.py
@@ -0,0 +1,17 @@
+id = 116
+name = 'evenlen/1 + oddlen/1'
+slug = 'check if the length of a list is even or odd'
+
+description = '''\
+<p><code>evenlen(L)</code>: the list <code>L</code> has an even number of elements.<br />
+<code>oddlen(L)</code>: the list <code>L</code> has an odd number of elements.</p>
+<pre>
+  ?- oddlen([1,2,3,4,5]).
+    true.
+  ?- oddlen([1,2,3,4]).
+    false.
+  ?- evenlen([1,2,3,4]).
+    true.
+</pre>'''
+
+hint = {}